The problem is whenever install Windows 7 Ultimate Edition on my PC, it doesn\'t take audio driver automatically. Downloading the Realtek driver didn\'t work. My system configuration:Processor : Intel Core 2 Duo.RAM : 2.5GB DDR2.Graphic Card : NVIDIA Series 8.HDD : 500 GB
install audio driver.
try a version before the present version
check for compatibility of driver and os
try installing audio driver again
Install windows 8, may be it will solve your problem